消弧线圈接地机组的定子基波零序电压保护误动分析  

Analysis on earth fault protection malfunction of generator with arc suppression coil grounding

作　　者：王昕 李乃永 苏欣[3] 张国辉 孙运涛 刘学思[4] 赵峰[5] 

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250002 [2]国网山东省电力公司,山东济南250002 [3]国网山东济南供电公司,山东济南250002 [4]华能国际电力股份有限公司德州电厂,山东德州253024 [5]华能威海发电有限责任公司,山东威海264205

出　　处：《电力系统保护与控制》2016年第7期140-144,共5页Power System Protection and Control

摘　　要：为了分析传递电压对机组定子接地保护的影响,以消弧线圈接地机组的定子接地保护误动为例,分析了传递电压自由振荡过程,得出传递电压延时衰减特性是导致保护误动的主要原因。通过对传递电压特征频率的研究,提出了一种快速判别机组补偿方式的方法,并通过PACAD仿真进行了验证。针对定子接地保护误动原因,完善了保护的传递电压闭锁逻辑,实现了在不牺牲保护快速性及灵敏性的前提下消除了传递电压的影响。实践证明,采取措施以后效果良好。By the case study on the protection malfunction of the unit with a neutral arc suppression coil grounding, the influence of transitive voltage on the stator earth fault protection is analyzed. The free oscillation of the transitive voltage is the main cause of the malfunction. By analyzing the characteristic frequency of the transitive voltage, a convenient method of estimation of compensation mode for the unit is proposed, which is proved by PSCAD simulation. As for the malfunction of the stator earth fault protection, the protection blocking logic is improved. The influence of transitive voltage is eliminated without sacrificing the rapidity and sensitivity of the protection. Practical application shows that it is effective by adoptinstre proposed measure.

关 键 词：零序电压 定子接地 定值计算 消弧线圈 仿真 发电机保护 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM475